如果我拥有一个基于领域(如年份(int)和Ord(int)的综合关键(初级或平原指数),将过滤<代码>WHERE Year=2011<>/code>从该关键标准中受益,或完全忽视该关键标准?
如果你在最左栏(N >= 1)上过滤,那么该指数至少可以使用(由于其他事实,仍然被忽视)。
因此,如果您的指数载于(年、年、月/日),而您通过<代码>年过滤,则该指数可以使用。
但是,如果你在<代码>上过滤, 单单单是“,该过滤器甚至不会被考虑――不能使用。
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